Telescopic lifting-gear.



K. NITSGHKE.

TELESCOPIC LIFTING GEAR.

APPLICATION FILED MAR. 26, 1910.

Patented Aug. 12, 1913.

2 SHEETS-SHEET 1.

K. NITSOHKE.

TELESCOPIC LIFTING GEAR.

APPLICATION FILED'MAR. 26, 1910.

Patented Aug. 12, 1913.

2 SHBBTSSHEET 2.

GMWuHnnHnHHHHHMHMHM KARL NITSCHKE, OF BERLIN, GERMANY.

TELESCOPIC LIFTING-GEAR.

Specification of Letters Patent.

Patented Aug. 12, 191 3.

Application filed March 26, 1910. Serial No. 551,640.

To all 11. 5.0772, '1' 5 may] concern Be it known that I. Kain.NIISGHKE, a subjectof the German Emperor, and residing at Berlin,Germany, have invented certain new and usefulImprovements in TelescopicLifting-Gear, of which the following is a specification.

The subject-matter of my invention istelescopic lifting-gear, whosetubes are pulled apart and. drawn together by means of a steel bandarranged within the same.

My lifting-gear can be employed for lifting loads of all kinds, people,antennae for radiotelegraphy, projectors, and also as a mast forsignaling purposes, phototelegraphy, and the like.

A primary object of my invention is to provide that the tubes of thelifting-gear are driven positively up and down, and that in both eventsthe tube next in order is only moved when the previous one has beenentirely drawn out or entirely drawn in.

Some illustrative embodiments of my invention are represented by way ofexample in the accompanying drawings, wherein Figure 1 is a verticalsection through part of my lifting-gear, three different forms of thesteel band being indicated therein; Fig. 2 is a vertical section showingmeans for guiding the steel band and mechanism for securing the tubes;Fig. 3 is an elevation, partly in section, showing the lifting-gear withthe tube elevating and fixing devices, and Fig. 4 shows the automaticfixing device in elevation.

Referring to the drawing, the telescopic tubes 1, 2, 3, 4 are preferablydriven positively by the steel band a rolled on a roller Z (Fig. 3)being guided by two press rolls /2-, 7t, pressed together by a screw 2'and driven upwardly by turning the crank-handle g secured to one of therolls. The band is kept most rigid and most suitable for raising loadswhen it occupies the entire section of the tubes, as shown at f in F g.1, but is also sufficiently rigid when it is cut tapered, as shown at u,and occupies the largest section of the tube at places, whereas, whenthe band has rectilinear, parallel sides as shown at o, and thereforeits breadth is only equal to the section of the top telescope tube,itmust be made correspondingly thicker.

I prefer to use a steel band which is recessed or shaped step-like as atf, fills the entire diametral section of the tube, and thus cannot move,out of position, such a hand being able, although relatively weak, tolift considerable loads, that is it acts in the tube like a rigidconnecting-rod. In order that the steel band may always have itsshoulders in the tubes suitable for the same, the tubes must not beraised and lowered irregularly, but in order.

The tubes are elevated in order by means of the spring-pulled pawl b ig.2) pivoted on tube 3; this pawl carries a pivoted pm d which can enterinto the tubes 1, 2, 3 and lock the same; the pin (Z'is withdrawn thethickness of a tube by the shoulders f of the rising band coacting withthe pawl, whereby one tube is released after another.

The tubes are caused to desc nd in order by the spring shackles orclamps 1 (Figs. 3 and 4) being automatically released by the pin m ofthe bracket 11., by which the shackles are automatically tightened asthe tubes are elevated. The construction and operation of the shackleswill be readily understood from Figs. 3 and 4; the top ends of' thetubes are slotted and each carries a shackle g, while the largest tubecarries a support or bracket n carrying a pin m. A bolt 8 having on theright a nut and on the left a head passes through the ends of eachshackle; outside one end of the shackle is secured a block p having aslanting face through which bolt .9 passes, and loose on the latter isan arm 0 having a projection 1' with aslant-ing face which correspondsto the slanting face on the block p. lVhen the shackle is locked the arm0 is opposite the pin m so that when the tube 2 for example movesupward, the shackle Q is tensioned and the inner tube is fixed, whereaswhen the tubes descend they are unlocked at the moment when one tubeabuts on the head of another. In order to keep the band always in themiddle of the rollers I provide a row of perforations in the band (Fig.9.), into which the teeth to provided in the middle of the rollersenter.

I claim 1. In telescopic lifting-gear, the combination, with a pluralityof telescopic tubes arranged one in another, of a flat, steel bandtherein occupying the greatest diametral section of each tube andfilling said section at at least one point in the length of each tubewhen the lifting-gear is extended, and means for raising and loweringsaid band and thereby extending and lowering the lifting- "ear.

8 2. In telescopic lifting-gear, the combination, with a plurality oftelescopic tubes arranged one in another, of a flat, steel band thereinfor coacting with and lifting each tube,'means for ralsing and loweringsaid band, and a spring-controlled locking device locking said tubes intheir closedposition and adapted to be actuated by the rising steelband.

3. In telescopic liftin gear, the combination, with a plurality otelescopic tubes arranged one in another, of a fiat, steel band thereinfor coacting with and lifting each tube, means for raising and loweringsaid band, a bracketcarrying a pin fixed on the lowest tube, the top ofeach tube being slit longitudinally and carrying an elastic clamp, meanson each clamp for tightening the same adapted to coact with and be0perated by said pin when the band is raised and lowered.

4. In telescopic lifting-gear, the combina tion, with a plurality oftelescopic tubes arranged one in another, of two press rolls pressed onetoward the other in the lowest tube, a centrally-perforated, fiat, steelband for coacting with and lifting each tube movable between said rolls,one of the rolls having teeth entering into the band, and a handlesecured to the toothed roll.

5. In telescopic liftin -gear, the combination, with a plurality oftelescopic tubes arranged one in another, of'a tapered, flat, steel bandtherein occupying the greatest diametral section of each tube andfilling said section at. at least one point in the length of each tubewhen the lifting-gear is extended, and means for raising and loweringsaid band and'thereby extending and lowering the lifting-gear.

In testimony whereof, I affix my signature in the presence oftwowitnesses.

KARL NiirsoHKn.

Witnesses HENRY HAsrER, WOLDEMAR HAUPT.

